Simulating nitrate drainage losses from a Walnut Creek watershed field.
D003198:Computer Simulation; D005308:Fertilizers; D005618:Fresh Water; D006801:Humans; D007484:Iowa; D008962:Models, Theoretical; D009566:Nitrates / Q000737:chemistry*; D014877:Water Pollution, Chemical
D005308:Fertilizers; D009566:Nitrates